https://github.com/vime-js/vime/issues/168#issuecomment-951155086

sveltekit-and-vime.svelte

<script>
  import { onMount } from 'svelte';

  export let src;
  let showPlayer = false;
  let player;

  onMount(async () => {
    const { defineCustomElements } = await import('@vime/core');
    defineCustomElements();
    showPlayer = true;
  });
</script>

{#if showPlayer}
  <vm-player bind:this={player}>
    <vm-video>
      <source data-src={src} type="video/mp4" />
    </vm-video>
    <vm-ui>
      <vm-default-controls />
    </vm-ui>
  </vm-player>
{/if}

@spences10 Oh!!